The following relations between CGLN
amplitudes and helicity
amplitudes will be used in our calculations.
(click
here for a larger image)
Further details can be found in D. Drechsel and
L. Tiator , J. Phys. G 18 (1992) 449-497 (scanned
version) For the Invariant Amplitudes A1,...,A6 we use the definition of F.
Berends et al. Nucl. Phys. B4 (1967) 1Channel: (pi0,p) (pi0,n) (pi+,n) (pi-,p)
Amplitudes: CGLN(F1,...,F6) Helicity(H1,...,H6) Invariant(A1,...,A6)
Choose kinematical variables
choose an independent (running)
variable: Q² W Q
choose values for Q², W, Q,
step
size and maximum value:
